xbox said "issue with account, go to accounts.live.com to resolve this" and I can't access...

I have 2 xboxes and I can login to my account normally from those and from my PC. I got an ultimate pass for my account. Then I was trying to setup an account for my son. 1st attempt was to add his email as family member in my account. But this way we couldn't play together on the same time at both xboxes with the ultimate pass.

2nd attempt was to create a full microsoft & xbox account using his email. Then buy an ultimate pass for his account. That seemed to have worked and on day 1 all was ok and we were playing together on both xboxes.

Next day though we couldn't login to his account. Xbox was saying something like "issue with account, go to accounts.live.com to resolve this". When I used my PC to try to login to the account, it was not possible. It was logging me in to the account of the family member (I think the system got confused because the email was the same for both accounts)

Then I had all sort of issues trying to contact microsoft tech support. I went through their automated assistant ,

https://support.xbox.com/en-GB/contact-us , and when it came the time to actually connect me to a real person, it had an issue saying something like "there was an issue, we are aware of it" etc. I did several attempts, one attempt was to ask to connect to an xbox specialist. After waiting for 15 mins I closed the window and later on got an email "Your Xbox question was sent to a specialist". I clicked the link later on and it took me to a broken page "Hey, what happened to this page?". Well , what can I say, they should have gone to AWS... This left me with the issue and no way to contact someone to help me out with it.

Anyway I need to contact someone from microsoft, is there a way to contact them that is not broken? I've paid for the ultimate pass for the missing account.

Thanks

:)